[Morgan666]

Hi,
I have a Knoxx copstock on a Mossberg 500. The recoil reduction works great but it shoots 2 feet high. I have other people shoot it with a variety of loads and it shoots 2 feet high for everyone. I put the orignal stock back on and then it shoots fine. I put the stock on another Mossberg 500 shotgun and that one shoots 2 feet high too. The stock and weapon are assembled correctly. Does anyone have any ideas on how to reduce this accuracy problem? I have not found any information on adjusting the stock except that it should not be done. Thank you.

[The Deer Hunter]

The shot shoots 2' high?

[3006mv]

which one is the copstock the overfolder? are you saying it prints 2 feet higher than normal and at what distance and ammo are you using?

[Morgan666]

Yes, the shotgun shoots 2 feet higher with the overfold copstock stock. I set up a target stand 5 ft tall 30 feet away and shot it with a 2 3/4 " slug, 3" slug, 7.5 2 3/4 birdshot, and 2 3/4" 00 buck. With the normal stock that came with the Mossberg 500 all of these load hit at he point of aim in the center of the target. With the copstock overfold stock folded out, the same shot gun fires all of these loads at the top of the target with the center of the target being the point of aim. We tried it with three different shooters and on two different Mossberg 500 shotguns. Barrels where 18.5 unrifled.

[Leadhead]

What kind of sights are you using.....might be a bad cheek weld.

[Double Naught Spy]

It is you, not the stock. The stock should not actually affect POI unless your POA has changed, maybe due to the cheek weld changing as noted by Leadhead. Chances are, you are look over your sights, or at least over the receiver to the front sight (if you just have a single bead).

As for being 2 feet high, you still have not said at what distance.

[Snarlingiron]

maybe due to the cheek weld changing as noted by Leadhead

This is a wire folder. There is no cheek weld.

http://www.knoxx.com/products/SpecOps_Folder.php

Apparently Blackhawk has decided to drop the "Cop Stock" designation in favor of Spec Ops Folder.

[Leadhead]

This is a wire folder. There is no cheek weld.

.....exactly.

Plus it's hard to get your eye down low to line up the bead and the receiver without getting smakced in the face by the wire.

[Morgan666]

The sights are just a front bead. The three of us have fired the shotgun have all been using shotguns for many years in trap, skeet, hunting, and defence. We probably own 20 shotguns between us. We are figuring that the problem has to do with way the stock works. I am hoping that someone knows a way to make an adjustment. Is this some sort of break-in period and the spring in the grip will settle down after a while? I bought the stock new in the packaging and have not attempted to modify it in anyway. I also forgot to mention. When we patterned the gun using dove shot, the pattern was greatly elongated up and down using the copstock compared to a more rounded pattern using the regular Mossberg stock.

[3006mv]

I would call the company and ask for some advise, maybe it is due to the design, as the spring in the grip could be causing the bbl to bounce up as the recoil is taken up? I have no idea, just a theory. Cup half full at least you will get head shots with you POA at center mass. :D

[Steve C]

The solution I guess would be to aim 2' low :)

The problem most likely is sight alignment and the way the stock makes you keep your head up. Recoil reduction should make the gun shoot lower.

[Leadhead]

How does it shoot with the stock folded?

[Dave McCracken]

Solution.....

Take that thing off. Re-install the original stock. They've been made pretty much the same since about 1810 for a reason as you have found out.

Sell the Knoxx to someone you do not like.

Chalk the whole thing up to experience.

[Ed Ames]

As another CopStock owner I've got to intrude a bit...

Dave -- if you'd like to try the CopStock out in greater depth I have one I'll let you have for a reasonable price...

Sorry, couldn't resist. :D

Seriously though... while "sell it" may be a bit extreme it's not far off the mark. Just depends on why you bought the folder in the first place. I specifically wanted compact storage with minimum disassembly so I bought a CopStock. I found it isn't as compact as I had hoped but it serves a specific purpose. It's also much harder to hit distant targets with, compared to the StockStock. Compromise. All folders/PGOs are a compromise. You sacrifice accuracy and simplicity for compactness. The main problem with the CopStock is that it's a three-way compromise... you give up accuracy for compactness then give up compactness for recoil redistribution. In the end it doesn't do anything very well. Well enough maybe but not very well.

How does it shoot with the stock folded?
Mine shoots fine. The recoil redistribution scheme works fairly well and I had no problem firing highwall slugs folded. Not the easiest thing to aim of course.

My experience is that the copstock made my shotgun less fun all around. It added an element of frustration both in use (25% harder to break clays... I can't say "2 feet high" but it is much harder to aim consistently) and storage (while shorter, the wire loop and bulky grip assembly bulks up the gun quite a bit) but sometimes fun must take the back seat. I can't recommend the CopStock but if you know the compromises involved and can live with them it may not be the worst.

[Omaha-BeenGlockin]

Not the stock shooting high---but the shooter.

[Orr89rocz]

i think the way the stock aligns could be the problem. changing the angle in which the stock meets the reciever could throw your barrel up at a angle.

you need to shim that angle back to stock. try measuring it and see how it looks. that copstock sounds like its not allowing you to align the bead up correctly, like the stock 'stock' does :)

And i personally dont like wire stocks.... you need some sort of cheek pad. Try the spec ops stock, its really sweet.

[Waywatcher]

I'd sell the dang thing. Sounds to me like it lets the barrel start moving a lot sooner than the lead exits.

[chris in va]

Mossberg has a spacer kit to correct sight alignment. I had to do this with my SpecOps as I couldn't get a good sight picture. The 'negative' spacer will drop the angle about a half inch, just enough.

Guys, having used a CopStock before I know what he's referring to.

[Tully M. Pick]

I'll take that rotten piece of junk off your hands. How's $20 sound?

[Ed Ames]

Chris's advice re: spacers is good. It slipped my mind but one of the first things I did when I got my mossberg was shim the stock to a better angle for me. I just used material at hand (rather than the fancy name-brand shims) but the results were good.

$20 sounds great for shipping... may need to kick the price up a bit if you more than an empty box though. :D

[Morgan666]

Thank you for the spacer advice. Makes sense and I will try it. To answer some of the other questions. This is intended to be my California camping gun. I also added the Knoxx Sidewinder kit to be able to quickly change loads and a little extra firepower. 7.5 dove shot is great for killing Rattlesnakes that find their way into the backyard. I bought Brenneke slugs for Black Bears just in case they choose to misbehave. OO buck is for the drunk two legged critters that think I look like a deer. Unfortunatly all three critters are very prolific in California camping. I used to take my double barrel 12 guage for snakes and my Kalashnikov for bears and two legged critters. I would perfer to just take one gun for all purposes.

[Rob1035]

I had a copstock on an old 500 I used to have. When extended, there was a lot of play in the hinge part, the buttstock probably moved about 1" up and down. I called Knoxx, they said to send it in, I did, they said it was "within spec" and sent it back. I sold it before even using it for a shot.

"Regular" stocks for me thanks.

[Leadhead]

I looked at the spec ops folder but found it too heavy, not comfortable to mount and really not that compact when folded.
I don't get why they designed it to not fold down lower over the receiver when folded....it sticks up so high and then the pistol grip sticks down and it ends up being to big to fit in a regular rifle case????
I think if you have to have a folder a side folder is a better option because the stock is not as wide as the Knoxx style and doesn't rub your jaw.
The Regular Spec Ops is much nicer.

[Morgan666]

I made a spacer out of aluminum that fit between the reciever and the copstock. It changed the angle just enough to meet the original stock. This worked great. I put 6 3" slugs into the black of a bullseye target at 60 feet. I then changed magazines and fired another shot. All of a sudden the grip slid forward. I looked and found that the top mount for the recoil reducing spring had broken and the spring has shot out the bottom of the grip. I am done with the Knoxx stock. The sidewinder kit works great after you mate it to your shotgun.

[Morgan666]

After a month and some reminding emails and phone calls, Knoxx sent me a specops stock to replace the broken copstock free of charge. Very nice.